22149798 has 32 divisors (see below), whose sum is σ = 49057920. Its totient is φ = 6610560.

The previous prime is 22149797. The next prime is 22149811. The reversal of 22149798 is 89794122.

It is a super-2 number, since 2×22149798² = 981227102881608, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22149797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1918 + ... + 6926.

It is an arithmetic number, because the mean of its divisors is an integer number (1533060).

Almost surely, 2^22149798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22149798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24528960).

22149798 is an abundant number, since it is smaller than the sum of its proper divisors (26908122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22149798 is a wasteful number, since it uses less digits than its factorization.

22149798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092.

The product of its digits is 72576, while the sum is 42.

The square root of 22149798 is about 4706.3571900144. The cubic root of 22149798 is about 280.8384645890.

The spelling of 22149798 in words is "twenty-two million, one hundred forty-nine thousand, seven hundred ninety-eight".